It wasn't really a repair shop, more about bolting parts on for expats. Parts and repairs are super cheap and not something to be afraid of.
I also can't imagine not having a bike in Saigon, it was one of the main reasons I moved there! The city is so massive and amazing to explore and you can really only do that if you own a bike. Or, in my case, I just bought and sold used bikes all the time. Probably went through 25+ during my time there.
> One of my expat buddies in Saigon owned a small scooter repair shop
Oh whoa! Which quan was this? I subsisted off Grab so I never had to worry about scooter repair.